Method of making valve lifters



March 20, 1928.

H. G. CARLSON METHOD OF MAKING VALVE LIFTERS,

Filed March 15, 1922 Patented Mar. 20,1928.

UNITED! STATES PATENT orrica.

SPRINKLER ('JOIlllUPAJNY OF MASSACHUSETTS,

CORPORATION OF MASSACHUSETTS.

OF WORCESTER, MASSACHUSETTS, A

mnrnon or MAKING VALVE LIFTERS.

Application filed Mai-ch15, 1922. Serial No. 543,952.

The object of this invention is to provide a new and improvedvalve-lifter. The valve lifter to which the invention is directed is theplunger interposed between the cam and valve of an automobile orhydro-carbon motor. This plunger is usually provided with a roller whichis engaged by the cam and also. with an adjusting screw which engagesthe lower end of the valve stem. These valve lifters are now usuallymade in one of two ways. In the first way,

stock is taken and cut and machined to obtain the desired shape. Thismethod is expensive and makes a lifter which iscomparatively heavy. Thesecond way these lifters are now made isto take a piece of tubular stockand insert bushings in the ends thereof to form reinforcements, theblank thus made being thereafter cut and machined to make the lifter.While this makes a lighter lifter, the method employed is expensive andthe lifter being made of separate parts is apt to come to pieces underthe continued reciprocation and jar in use.

I have discovered that an improved valve lifter can be made by drawing acup or tube closed at one end from flat stock in such a manner that thebody portion of the blank thus formed will be as thin as desired but soso that the stock near the open end of the blank will be much thickerthan the body portion and so that the bottom or closed end of the blankalso body portion. The thicker stock around the 85 open "end of theblank is then pressed inwardly, to form a blank or tube having a uniformoutside diameter, the stock near the I open end thereof being thlckerthan the body portion thereof, and the bottom also being 40 thicker thanthe body portion. Then the blank or tube is machined and ground to makethe finished lifter. A valve lifter is thus rovided which can be verycheaply manu actured, which is light and which ein integral cannot cometo pieces in use.

t also will be-noticedthat as the article is made from flat stock drawnor pressed into integral, tubular or cup-like form; the grain of themetal will extend continuously throughout the length thereof whereby itcan be made very light and whereby the same will last a long timewithout wear, as

a solid piece of will be thicker than the,

it reciprocates axially in its cage or hearing.

The invention is illustrated in the accompanying drawing, in which Figs.1, 2, 3, 4 and 5 are cross-sectional views showing the drawing stepsemployed;

Fig. 6- is a view similar to Fig. 5;

Fig. 7 is an end view showing the blank or tube machined, and

8 is a view showing the lifter in operatlve position.

Referring to the drawing, and in detail, it will be seenthat I firsttake a stock A and draw the same by a suitable punch and die into a cupor tube B, as shown in Fig. 1. This cup B is then elongated by piece offlat,

another drawing process to assume the shape shown at C in Fig. 2. Thiscup C is then sub ected to a drawingand elongating process so that theside walls or body portion thereof will be reduced in thickness, asillus tratedat D in Fig. 3. This drawing process is then again conductedwith another set of dies to produce the shape shown at E in Fig. 4, thatis, a tube or blank having thin stock along its body portion E, thickerstock E around the portion near the open end of the tube, and a bottom Ethicker than the body portion. The portion E is then pressed or crimpedin to assume the shape shown at F in Fig: 5, or in other words, a tubeor blank 1s produced having a body portion F of relatively thin stock,the stock F near the open end of the tube being thicker and the bottom Fof'the blank also being thicker than the body portion, said tube beingintegral and having a v uniform outside diameter. The blank thus make upthe completed article. This machining consists in cutting a slot 10across formed then is machined to y the open end thereof, in drilling atransverse" hole 11 through punching in a hole 12 in the closed end ofthe tube and in tapping or threading this hole. After these machineoperations are performed, the lifter can be ground so as to have auniform cylindrical diameter.

The lifter is used by placing a roller 13 in the groove or slot 10,which roller is held in placeby apin 14 driven into the hole 11' throughsaid roller 13, and by threading a screw 15 lnto the hole 12, ,whichscrew v1s usually provided with locknuts 16 and 17.

this thickened stock, in

The lifter with these parts is placed in position so that the roller 13will be engaged by the cam of the motor and so that the screw 15 willengage the lower end of the valve stem, as shown in Fig. 8. Thus, alight, strong, cheap lifter is provided for v the purpose stated.

'The'details and the operations may be varied by a skilled mechanicwithout depart-. ing from-the scope of my invention as expressed in theclaims.

Having thus fully described my invention,-

what I claim and desire to secure by Letters Patent is :i R v -1. Themethod of making a valve lifter which consists in drawing a tube or cupfrom flat stock, elongating the tube so; that the body portion thereofwill be thin. and so that the stock near the open end thereof will bethick, and crimping. or pressing in the stock near said open'endso toproduceia blank in integral tubular form having a uniform outsidediameter with the stock near the open end thicker than the body portionthereof. V

2. The method of making a valve lifter which consists in drawing a tubeor cup fromflatstock, elongating thetube .so as to provide thicker stocknear the open-end, and

on the closed end portion relatively to' the body portion thereof, andcrimping or forcing inwardly the thicker stock around the open end toproduce a blank having a uni- "form outside diameter.

- 3. The method of making a valve lifter which consists indrawing a tubeor cup from flat stock, elongating the tube so that the body portionthereof will be thin and so that the stock near the open end thereofwill be thick, and crimping or pressing in the stock near said open endso as to produce a blank in integral tubular form having a uniformoutside diameter with .the stock near the open end thicker than the bodyportion thereof, and then slotting and drilling the open end of'thisblank.

4. The method of making a valve lifter which consists in drawing a tubeor cup "thereof.

In testimony whereof I have hereunto affixed my signature. v. a

' HJALMAR ea, CARLSON.

